package com.kimari.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

/**
 * 使用 XML 构建 sqlSessionFactory
 * 从 sqlSessionFactory 中拿到 sqlSession
 * @author Reimu
 */
public class MybatisUtils {

    private static SqlSessionFactory sqlSessionFactory;

    static {
        try {
            // 获取 sqlSessionFactory 对象
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 获得 sqlSession 对象
     * @return 返回一个 sqlSession 对象
     */
    public static SqlSession getSqlSession() {
        // 开启事务
        return sqlSessionFactory.openSession(true);
    }
}
